Question: What is the biggest terrorist attack by the group Bush said the 'war on terror' began with, on the country with the Federal Detention Center found where Espers was formed?
Context: Document 1: September 11 attacks: Journalist Yosri Fouda of the Arabic television channel Al Jazeera reported that in April 2002 Khalid Sheikh Mohammed admitted his involvement in the attacks, along with Ramzi bin al-Shibh. The 9/11 Commission Report determined that the animosity towards the United States felt by Mohammed, the principal architect of the 9/11 attacks, stemmed from his "violent disagreement with U.S. foreign policy favoring Israel". Mohammed was also an adviser and financier of the 1993 World Trade Center bombing and the uncle of Ramzi Yousef, the lead bomber in that attack.Mohammed was arrested on March 1, 2003, in Rawalpindi, Pakistan, by Pakistani security officials working with the CIA. He was then held at multiple CIA secret prisons and Guantanamo Bay where he was interrogated and tortured with methods including waterboarding. During U.S. hearings at Guantanamo Bay in March 2007, Mohammed again confessed his responsibility for the attacks, stating he "was responsible for the 9/11 operation from A to Z" and that his statement was not made under duress.
Document 2: Federal Detention Center, Philadelphia: The Federal Detention Center (FDC Philadelphia) is a United States Federal prison in Center City, Philadelphia, Pennsylvania which holds male and female inmates prior to or during court proceedings, as well as inmates serving brief sentences. It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice.
Document 3: Espers (band): Espers is an American psychedelic folk band from Philadelphia, United States, that is part of the emerging indie folk scene. They formed in 2002 as a trio of singer-songwriter Greg Weeks, Meg Baird and Brooke Sietinsons but later expanded to a sextet including Otto Hauser, Helena Espvall and Chris Smith. Their music is reminiscent of late-sixties British folk as well as many contemporary folk acts such as Six Organs of Admittance. Most of the band's members have also featured on recordings by a number of other folk artists such as Nick Castro and Vashti Bunyan and as a result have become an important part of the psychedelic folk revival.
Document 4: War on Terror: On 16 September 2001, at Camp David, President George W. Bush used the phrase war on terrorism in an unscripted and controversial comment when he said, "This crusade – this war on terrorism – is going to take a while, ... " Bush later apologized for this remark due to the negative connotations the term crusade has to people, e.g. of Muslim faith. The word crusade was not used again. On 20 September 2001, during a televised address to a joint session of congress, Bush stated that, "(o)ur 'war on terror' begins with al-Qaeda, but it does not end there. It will not end until every terrorist group of global reach has been found, stopped, and defeated."
Answer: the 9/11 attacks
Reasoning steps: Espers >> location of formation Answer: Philadelphia
Federal Detention Center, Philadelphia >> country Answer: the United States
Where did Bush say the 'war on terror' begins? Answer: with al-Qaeda
what is the biggest terrorist attacks by the Islamic terrorist group with al-Qaeda against #2 Answer: the 9/11 attacks